.github: bump actions/checkout from 4.1.0 to 4.1.4 (#395)

See the changelog [1] and new commits [2]

[1] https://github.com/actions/checkout/blob/v4.1.4/CHANGELOG.md
[2] actions/checkout@8ade135...0ad4b8f

.github/workflows/markdownlint.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608
+        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b
 
       - name: Run markdownlint
         uses: DavidAnson/markdownlint-cli2-action@510b996878fc0d1a46c8a04ec86b06dbfba09de7

.github/workflows/shellcheck.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608
+        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b
 
       - name: Run shellcheck
         uses: ludeeus/action-shellcheck@00cae500b08a931fb5698e11e79bfbd38e612a38

.github/workflows/tests.yml

@@ -14,7 +14,7 @@ jobs:
     name: Check exercises (${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608
+    - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b
 
     - name: Install Zig
       shell: bash

.github/workflows/zig-fmt.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
     - name: Checkout
-      uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608
+      uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b
 
     - name: Install Zig
       run: ./.github/bin/install-zig